Method for bifurcating blanks



R. L. WILCOX.

' METHOD OF BIFUBCATING BLANKS.

APPLICATION FIVLED FEB-l2, 1920.

, 1710672 for I RICHARD LESTER WILCOX, or WATERBURY, CONNECTICUT,ASSIGNOR TO THE WATERBURY FARREL FOUNDRY AND MACHINE COMPANY, OFWATERBURY, CONNECTICUT, A CORPORATION on CONNECTICUT.

METHOD FOR BIFURCATING BLANKS.

Specification of Letters Patent. 7 I?&@11fi;@d A 1 1922 Applicationfiled February 12, 1920. Serial No. 358,015.

To all whom it may concern:

Be it known that I, RICHARD LESTER XVII.- cox, a citizen of the UnitedStates, residing at WVaterbury, in the county of New Haven and State of-Connecticut, have invented certain new and useful Improvements inMethods for Bifurcating Blanks, of which the following is aspecification, reference being had therein to the accompanying drawin s.

Tly invention has particular reference to a new and improved method forbifurcating blanks, the bifurcation being accomplished by slotting theshank of the blank, which when completed has walls that taper towardeach other as they approach the head of the blank. I

The object of my invention, among other things, is to make the cuts withtools, that so far as possible are of standard size and shape andreadily procurable in the open market, and with the minimum number ofspecially prepared tools, and these so designed as to be economicallyconstructed and capable of standing the maximum strain and wear.

To these and other ends, my invention consists in a method forbifurcating blanks substantially as shown herein and illustrated in theaccompanying drawings, wherein:

Figure 1 is a view of the blank after the completion of the firstoperation thereon;

Figure 2 is a view of the same blank after the completion of asubsequent operation thereon;

Figure 3 is a View of the same blank after the completion of a stilllater operation in the series; and

Figure 4 is an illustration of the completed bifurcated blank.

In the drawings, I have illustrated the blank as having a round head butdesire it to be understood that the size and shape of the head isentirely immaterial to my invention, in fact it is immaterial whetherthe blank be provided with a head or nut. The slot in the blank isherein shown as terminating adjacent to the underside of the head, butit may terminate at a point distant therefrom, if so desired.

In the drawings the blank shown has a shank 10 and a head 11. The firststep in the practice of my invention and improved method consists incutting the slot 12 in the end of the shank by a cutter which I haveshown by broken lines and designated by the numeral 13, this slotpreferably being substantlally the same width as the finished slot atthe bottom thereof.

The second slot 15 is now made in the blank as anextension of the slot12 and of the same width thereof, by a cutter 14: of the same standardtype and shape as the cutter 13. Subsequently the slot 15 is extended toproduce the slot 16 which is formed by the cutter 17 of the same generalshape as the cutters 13 and 14. The shank now has a slot ofsubstantially uniform width extending from the end of the blank to apoint adjacent to the head and formed, as shown herein, by three cutterswhich are of standard size and shape and readily procurable in the openmarket. These several cuts 12, 15 and 16 may be made with the samecutter, if desired, instead of three cutters as herein shown. Thedesirability of having three cutters, instead of one, being to reducethe wear and strain upon each of the cutters and while I have shownthree of these slots in the series, a greater or less number may be madeas may be desired, this depending upon the tools, length of the blank,etc, but for all practical purposes, three are sufiicient.

The final and last out is made with a cutter 18 having teeth 19 thereonof the same shape in cross section on the cutting edge as the finishedslot 20. 'This cutter is passed through the slot 16, substantially asshown in Figure 4, removing the stock from the sides of the slot andtruing up the same to complete the finished slot. The cutter 18 isspecially designed, but the teeth 19 are of such size as will stand themaximum strain and have the minimum amount of work to do, in fact thelimited volume of material to be removed by this cutter is nothing morethan a substantially truing up and shaping the walls of the already cutslot.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

l. The method for bifurcating blanks comprising the slotting of theblank with one or more cuts of substantially uniform width in alignmentwith each other and substantially parallel to the length of the blank,then cutting the sides of the said cuts to form the sides of thefinished slot.

2. The method for bifurcating blanks consisting in slotting the blankwith one or more cuts of substantially equal width in alignment witheach other and substantially parallel with the length oi the blank, thewidth of one of said cuts being substantially the same as that of thefinished. slot at the narrowest point thereof, and then cutting thesides 01* the said cuts to form the sides of the finished slot havingconverging walls.

3. The method for biturcating blanks consisting in slotting the blankwith cuts oi substantially equal width in alignment with each other,thereby producing a slot with substantially parallel sides and thencutting both sides of said slot so as to produce a finished slot, thewalls of which taper on both sides thereof toward each other as theyapproach one end of the slot.

4:. The method for biturcating blanks with a slot having convergingwalls, consisting in first cutting from the blank so much thereof as isin the substantially longitudinal center of said slot, the walls of saidout portion being substantially parallel with each other, and thenremoving from the walls o1 said out portion so much thereof as isnecessary to produce the finish-ed slot.

5. The method of bifurcating blanks comprising the slotting of the blankwith one or more cuts in alignment then cutting the blank adjacent tothe aforesaid cut so as to form the sides of the finished slot.

with each other and i In testimony whereof, I have hereunto f aifixed mysignature.

RICHARD LESTER wrLooxlj

